Pipeline connection joints and their connection methods

Abstract

This invention belongs to the field of pipeline connection and sealing technology, specifically relating to a connection joint that presses sealing surfaces together using components, and more particularly to a pipeline connection joint and its working method. The pipeline connection joint, through a radial pre-alignment structure of the insert ring and slot, allows for blind installation in confined clean spaces, avoiding the problem of seal ring failure caused by misalignment during repeated pipeline disassembly and maintenance when assembling multiple sealing surfaces. Simultaneously, the inclined section drive design of the axial tensioning limiting strip ensures an interference fit between the retaining ring and the retaining groove. Combined with the self-lubricating properties of the sealing ring material, the contact stress distribution on the sealing surface is more uniform, achieving axial clamping and thus improving assembly convenience and preventing seal failure caused by manual contact of the sealing surfaces.

Description

Technical Field

[0001] This invention belongs to the field of pipeline connection and sealing technology, specifically relating to a connection joint that presses sealing surfaces together using components, and more particularly to a pipeline connection joint and its connection method. Background Technology

[0002] In semiconductor manufacturing, cleaning, and assembly equipment, fluoroplastic piping systems with excellent corrosion resistance are required extensively to transport high-purity chemical reagents or high-temperature fluid media (≤250℃). These piping systems have extremely high requirements for sealing, cleanliness, and corrosion resistance.

[0003] In related technologies, pipeline interfaces often adopt metal ferrule or threaded connection structures, requiring precise manual alignment of the main sealing surface and the auxiliary sealing surface. In confined clean spaces, operators are prone to misalignment of the sealing surfaces due to obstructed vision or operational errors, resulting in localized stress concentration or sealing failure. At the same time, the sealing rings have low hardness and large deformation, making it difficult to ensure the coaxiality of multiple sealing rings during manual assembly, thus affecting the service life of the sealing rings.

[0004] Therefore, how to avoid sealing failure of pipe connection joints due to misalignment of the sealing surface is a technical problem that urgently needs to be solved.

[0005] It should be noted that the information disclosed in this background section is only for understanding the background technology of the present application concept, and therefore, the above description is not considered to constitute prior art information. Summary of the Invention

[0006] This disclosure provides at least one pipeline connection joint and its connection method.

[0007] In a first aspect, embodiments of this disclosure provide a pipe connection fitting, including:

[0008] The outer tube is equipped with a slot;

[0009] The first and second connectors are set relative to each other;

[0010] A sealing ring is provided between the first connector and the second connector;

[0011] A snap fastener, which covers the slot on the outer tube, to lock the first connector, the sealing ring, and the second connector.

[0012] The sealing ring has two side walls that extend outward along the axial direction to form an insert ring and a retaining ring, respectively.

[0013] The first connector and the second connector are provided with slots and abutment grooves at the mating points with the insertion ring and the abutment ring;

[0014] Furthermore, the length of the insert ring is longer than that of the abutment ring;

[0015] During assembly, the insert ring mates with the slot, and after radial alignment, it is placed into the slot.

[0016] The two side walls of the slot are respectively provided with axial tension limiting strips. After the outer sleeve rotates, the axial tension limiting strips cause the abutment ring to abut against the abutment groove, thereby completing the axial clamping.

[0017] In one optional embodiment, the axial tensioning limiting strip includes:

[0018] Inclined sections and horizontal sections;

[0019] When the outer tube rotates, the inclined section of the axial tensioning limit strip abuts against the corresponding first connector and second connector, and drives the first connector and second connector to move toward each other.

[0020] In one optional embodiment, the first connector and the second connector are provided with abutment blocks at the fitting points with the axial tensioning limit strip;

[0021] When the first connector, sealing ring and second connector are placed into the slot, the abutment block is positioned close to the inclined section of the axial tension limiting strip.

[0022] In one optional embodiment, the length of the slot is L1;

[0023] The distance between the abutting surface of the first connector and the abutting surface of the second connector after assembly is L2;

[0024] Where L1≥L2.

[0025] In one optional embodiment, the mating surface of the insert ring is a vertical surface;

[0026] The mating surface of the abutment ring is an inclined surface, and the length of the outer side wall of the abutment ring is greater than the length of the inner side wall of the abutment ring.

[0027] In one optional embodiment, the sealing ring has an annular cavity near its inner side;

[0028] The sealing ring also has a through hole communicating with the annular cavity;

[0029] The top of the sealing ring is provided with a pressure piston rod, and the air outlet of the pressure piston rod is connected to the through hole;

[0030] The buckle and the pressure piston rod.

[0031] In one alternative embodiment, the liquid pressure within the pipe connection joint increases, squeezing the annular cavity to push the push rod of the pressurized piston rod outward.

[0032] By pressing the push rod of the pressurizing piston rod with external force, the pressure inside the annular cavity is increased, thereby increasing the holding force between the abutting ring and the abutting groove.

[0033] In one optional implementation, both the first connector and the second connector are interfaces for the corresponding valves;

[0034] Alternatively, one of the first connector and the second connector may be a valve interface, and the other may be connected to a pipeline interface.

[0035] In one optional embodiment, the sealing ring is made of any one of polytetrafluoroethylene, tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer, polyvinylidene fluoride, and polyetheretherketone.

[0036] Secondly, this disclosure also provides a connection method for pipe connection joints as described above, the connection method comprising:

[0037] The insert ring mates with the slot to complete the radial alignment of the first connector, the sealing ring, and the second connector;

[0038] After docking, the first connector, sealing ring, and second connector are placed into the slot of the outer tube;

[0039] The outer sleeve is rotated by external force, so that the first connector and the second connector move towards each other through the two axial tensioning limit strips, so that the retaining ring abuts against the retaining groove and completes the axial clamping;

[0040] Fit the clips onto the slots on the outer tube to complete the connection.

[0041] The beneficial effects of this invention are that the pipe connection joint and its connection method, through the radial pre-alignment structure of the plug ring and slot, enable blind installation in a confined clean space. This avoids the problem of sealing ring failure caused by misalignment during manual assembly of multi-sealing-surface connection joints when repeatedly disassembling and maintaining pipes. At the same time, the inclined segment drive design of the axial tensioning limit strip makes the retaining ring and retaining groove form an interference fit. Combined with the self-lubricating properties of the sealing ring material, the contact stress distribution of the sealing surface is more uniform, completing axial clamping, thereby improving the convenience of assembly and avoiding sealing failure caused by manual contact of the sealing surfaces.

[0042] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention are realized and obtained through the structures particularly pointed out in the description and the drawings.

[0043] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0044] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0045] Figure 1 This is a schematic diagram of the structure of the pipe connection joint provided in the embodiments of this disclosure;

[0046] Figure 2 This is a partial structural schematic diagram of a pipe connection joint provided in an embodiment of this disclosure;

[0047] Figure 3 A cross-sectional view of a pipe connection joint provided in an embodiment of this disclosure;

[0048] Figure 4 This is a schematic diagram of the outer sleeve provided in an embodiment of the present disclosure;

[0049] Figure 5 A flowchart of a connection method for a pipe connection joint provided in a disclosed embodiment.

[0050] In the diagram: 100, outer sleeve; 110, slot; 111, axial tensioning limit strip; 111a, inclined section; 111b, horizontal section; 200, first connector; 210, slot; 220, abutment groove; 230, abutment block; 300, second connector; 400, sealing ring; 410, insertion ring; 420, abutment ring; 430, annular cavity; 440, through hole; 450, pressure piston rod; 500, snap fastener. Detailed Implementation

[0051] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0052] In this document, when it is mentioned that a first component is located on a second component, this can mean that the first component can be directly formed on the second component, or that a third component can be inserted between the first and second components. Furthermore, in the accompanying drawings, the thickness of the components may be exaggerated or reduced for the purpose of effectively describing the technical content.

[0053] In this document, when an element or layer is referred to as “located,” “joined to,” “connected to,” “attached to,” or “coupled to” another element or layer, it may be directly located, joined, connected, attached to, or coupled to the other element or layer, or there may be intermediate elements or layers present. Conversely, when an element is referred to as “directly on another element or layer,” “directly joined to,” “directly connected to,” “directly attached to,” or “directly coupled to” another element or layer, there may be no intermediate elements or layers present. Other terms used to describe relationships between elements should be interpreted in a similar manner (e.g., “between” versus “directly between,” “adjacent” versus “directly adjacent,” etc.). As used herein, the term “and / or” includes any and all combinations of one or more of the related listed items.

[0054] In this document, exemplary embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings. As used herein, expressions such as “at least one of…” modify the entire list of elements when following a list of elements, rather than individual elements in the list. For example, the expression “at least one of a, b, and c” should be understood to include only a, only b, only c, both a and b, both a and c, both b and c, or all of a, b, and c.

[0055] The terminology used herein is for the purpose of describing specific exemplary configurations only and is not intended to be limiting. As used herein, the singular articles “a,” “an,” and “the” may also be intended to include plural forms unless otherwise expressly stated herein. The terms “comprising,” “including,” and “having” are inclusive and thus specify the presence of features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein should not be construed as requiring them to be performed in the specific order discussed or shown, unless specifically identified as such. Additional or alternative steps may be employed.

[0056] As used herein, the phrases “in one embodiment,” “according to one embodiment,” “in some embodiments,” etc., generally refer to the fact that a particular feature, structure, or characteristic following the phrase can be included in at least one embodiment of this disclosure. Therefore, a particular feature, structure, or characteristic can be included in more than one embodiment of this disclosure, such that these phrases do not necessarily refer to the same embodiment. As used herein, the terms “example,” “exemplary,” etc., are used to “serve as an example, instance, or illustration.” Any implementation, aspect, or design described herein as “example” or “exemplary” is not necessarily to be construed as preferred or superior to other implementations, aspects, or designs. Rather, the use of the terms “example,” “exemplary,” etc., is intended to present concepts in a specific manner.

[0057] Research has revealed that the pipe interfaces in related technologies mostly adopt metal ferrule or threaded connection structures, requiring precise manual alignment of the main sealing surface and the auxiliary sealing surface. In confined clean spaces, operators are prone to misalignment of the sealing surfaces due to obstructed vision or operational errors, resulting in localized stress concentration or sealing failure. At the same time, the sealing rings have low hardness and large deformation, making it difficult to ensure the coaxiality of multiple sealing rings during manual assembly, thus affecting the service life of the sealing rings.

[0058] Based on the above research, this disclosure provides a pipe connection joint and its connection method. Through the radial pre-alignment structure of the insertion ring 410 and the slot 210, blind installation can be achieved in a confined clean space. This avoids the problem of sealing ring failure caused by misalignment when manually assembling the multi-sealing joint during repeated disassembly and maintenance of the pipeline. At the same time, the inclined segment drive design of the axial tensioning limit strip makes the abutment ring and the abutment groove form an interference fit. Combined with the self-lubricating properties of the sealing ring material, the contact stress distribution of the sealing surface is more uniform, completing the axial clamping, thereby improving the convenience of assembly and avoiding sealing failure caused by manual contact of the sealing surface.

[0059] The shortcomings of the above solutions are the result of the inventor's practical experience and careful research. Therefore, the discovery process of the above problems and the solutions proposed in this disclosure should be considered as the inventor's contribution to this disclosure.

[0060] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0061] The following detailed description of some embodiments of the present invention is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0062] Please see Figure 1 and Figure 2 At least one embodiment provides a pipe connection fitting, including: an outer sleeve 100 having a groove 110; a first connector 200 and a second connector 300 disposed opposite to each other; a sealing ring 400 disposed between the first connector 200 and the second connector 300, wherein the first connector 200 and the second connector 300 are inserted into the groove 110 after being connected by the sealing ring 400; and a buckle 500 covering the groove 110 of the outer sleeve 100 to lock the first connector 200, the sealing ring 400, and the second connector 300.

[0063] Please see 2 and Figure 3 The sealing ring 400 has two sidewalls extending outward along the axial direction to form an insert ring 410 and a retaining ring 420, respectively. The first connector 200 and the second connector 300 are provided with slots 210 and retaining grooves 220 at their mating points with the insert ring 410 and the retaining ring 420, respectively. The insert ring 410 is longer than the retaining ring 420. During assembly, the insert ring 410 is aligned radially with the slot 210 by external force. Then, the aligned first connector 200, sealing ring 400, and second connector 300 are placed into the slot 110. The slot 110 has two sidewalls provided with axial tensioning limiting strips 111. After the first connector 200, sealing ring 400, and second connector 300 are placed into the slot 110, they are rotated by external force (rotation direction as shown in the image). Figure 3 As shown in Figure F, the outer sleeve 100 is used to drive the first connector 200 and the second connector 300 to move towards each other via the two axial tensioning limiting strips 111 (the first connector 200 moves along...). Figure 3 The second connector 300 moves in the direction shown by F1. Figure 3 (Move in the direction shown by F2) so that the abutment ring 420 abuts against the abutment groove 220 to complete the axial clamping.

[0064] The radial pre-alignment structure of the insert ring 410 and the slot 210 avoids the problem of seal ring misalignment failure caused by low coaxiality when manually assembling multi-sealing surface connection joints. Blind assembly operation can be achieved in a small clean space. The inclined section 111a of the axial tensioning limit bar 111 drives the retaining ring 420 and the retaining groove 220 to form an interference fit. Combined with the self-lubricating properties of the sealing ring 400 material, the contact stress distribution of the sealing surface is more uniform, and axial clamping is completed, thereby improving the convenience of assembly and avoiding sealing failure caused by manual contact of the sealing surfaces.

[0065] Please see Figure 3 and Figure 4The axial tension limiting strip 111 includes an inclined section 111a and a horizontal section 111b. When the outer sleeve 100 rotates, the inclined section 111a of the axial tension limiting strip 111 abuts against the corresponding first connector 200 and second connector 300, and drives the first connector 200 and second connector 300 to move towards each other.

[0066] The design of the inclined section 111a converts rotational motion into linear propulsion, enabling the first connector 200 and the second connector 300 to move smoothly and evenly toward each other during assembly, avoiding misalignment of the sealing surface or local stress concentration caused by uneven force during traditional manual alignment.

[0067] Please continue reading. Figure 3 A retaining block 230 is provided at the fitting points of the first connector 200 and the second connector 300 with the axial tension limiting strip 111. When the first connector 200, the sealing ring 400, and the second connector 300 are placed into the slot 110, the retaining block 230 is positioned close to the inclined section 111a of the axial tension limiting strip 111. The precise fit between the retaining block 230 and the inclined section 111a of the axial tension limiting strip 111 eliminates the risk of axial displacement of the connector during movement, ensures the coaxiality of the multiple sealing rings 400, and allows operators to achieve "blind installation" without repeated adjustments, effectively solving the problem of misalignment of the sealing surface caused by obstructed vision or operational errors in the prior art.

[0068] It should be noted that, in order to facilitate the installation of the first connector 200 and the second connector 300, the length of the slot 110 is L1; the distance between the abutting surface of the first connector 200 and the abutting surface of the second connector 300 after assembly is L2; ​​wherein, L1≥L2, thereby providing the necessary tolerance space for pipeline connection.

[0069] Please continue reading. Figure 3 The mating surface of the insert ring 410 is a vertical surface; the mating surface of the abutment ring 420 is an inclined surface, and the length of the outer side wall of the abutment ring 420 is greater than the length of the inner side wall of the abutment ring 420.

[0070] The vertical surface of the insert ring 410 enables the radial pre-alignment of the first connector 200, the sealing ring 400, and the second connector 300. The asymmetrical design of the retaining ring 420 allows it to expand outward under pressure, enhancing the surface contact with the retaining groove 220, uniformly dispersing fluid pressure, and improving the sealing effect.

[0071] Please participate Figure 2 and Figure 3The sealing ring 400 has an annular cavity 430 near its inner side; the sealing ring 400 also has a through hole 440 communicating with the annular cavity 430; a pressure piston rod 450 is provided on the top of the sealing ring 400, and the air outlet of the pressure piston rod 450 communicates with the through hole 440; the push rod of the pressure piston rod 450 protrudes from the buckle 500.

[0072] Specifically, the increased liquid pressure in the pipe connection joint squeezes the annular cavity 430, pushing the push rod of the pressurizing piston rod 450 outward; by pressing the push rod of the pressurizing piston rod 450 with external force, the pressure in the annular cavity 430 is increased, thereby increasing the holding force between the abutment ring 420 and the abutment groove 220.

[0073] It should be noted that when the push rod of the pressurizing piston rod 450 extends outward, the push rod of the pressurizing piston rod 450 is kept in a pressed state by external force to increase the pressure in the annular cavity 430. After the maintenance personnel stabilize the liquid pressure, the pressing state of the push rod of the pressurizing piston rod 450 is released.

[0074] When the fluid pressure inside the pipe fluctuates, the deformation of the sealing ring 400 can be automatically adjusted to avoid seal failure caused by sudden pressure increases. At the same time, when maintaining the pipe connection joints, the piston rod can be manually fixed and lifted, and then the ferrule tube can be separated from the first connector 200, the sealing ring 400, and the second connector 300, thereby improving maintenance efficiency.

[0075] Please see Figure 1 and Figure 2 Both the first connector 200 and the second connector 300 are interfaces for corresponding valves; or, one of the first connector 200 and the second connector 300 is a valve interface, and the other is connected to a pipeline interface. This universal interface design allows the connector to be flexibly applied to various connection scenarios such as valve-to-valve and valve-to-pipeline connections, improving the modularity of the equipment.

[0076] Please continue reading. Figure 3 The sealing ring 400 is made of any one of polytetrafluoroethylene, tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer, polyvinylidene fluoride, and polyether ether ketone.

[0077] Please see Figure 5 At least one embodiment also provides a connection method for pipe connection joints as described above, the connection method comprising:

[0078] S110: The insertion ring 410 mates with the slot 210 to complete the radial alignment of the first connector 200, the sealing ring 400, and the second connector 300;

[0079] S120: The first connector 200, sealing ring 400 and second connector 300 after docking are placed into the slot 110 of the outer tube 100;

[0080] S130: The outer sleeve 100 is rotated by external force, so that the first connector 200 and the second connector 300 move toward each other through the two axial tensioning limit bars 111, so that the retaining ring 420 abuts against the retaining groove 220 to complete the axial clamping;

[0081] S140: Place the buckle 500 onto the slot 110 of the outer tube 100 to complete the connection.

[0082] In summary, this invention provides a pipe connection joint and its connection method. The pipe connection joint, through the radial pre-alignment structure of the insert ring 410 and the slot 210, avoids the problem of seal ring misalignment failure caused by low coaxiality when manually assembling multi-sealing-surface connection joints. It allows for blind assembly in confined clean spaces. The inclined segment 111a of the axial tensioning limiting strip 111's drive design ensures an interference fit between the retaining ring 420 and the retaining groove 220. Combined with the self-lubricating properties of the sealing ring 400 material, the contact stress distribution on the sealing surface is more uniform, completing axial clamping and thus improving assembly convenience and avoiding seal failure caused by manual contact of the sealing surfaces.

[0083] In the description of the embodiments of the present invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention based on the specific circumstances.

[0084] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence unless expressly indicated herein. Therefore, without departing from the teachings of the exemplary embodiments, the first element, component, region, layer, or segment discussed above may be referred to as a second element, component, region, layer, or segment.

[0085] Spatially relative terms, such as “inside,” “outside,” “below,” “below,” “down,” “above,” “up,” etc., may be used herein to describe the relationship between one element or feature illustrated in the figures and another element or feature. In addition to the orientations depicted in the figures, spatially relative terms may be intended to cover different orientations of the device in use or operation. For example, if the device in the figure is flipped, an element described as “below” or “below” other elements or features would be oriented as “above” other elements or features. Thus, the example term “below” can cover both above and below orientations. The device may be oriented in other ways (rotated 90 degrees or in other orientations), and the spatially relative descriptors used herein are interpreted accordingly.

[0086] In the above discussion, unless otherwise stated, when used to describe numerical values, the terms “about,” “approximately,” “basically,” etc., indicate a change of + / - 10% in that value.

[0087] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A pipe connection fitting, characterized by, The utility model relates to a pipeline connecting joint, which comprises: an outer sleeve (100) provided with a clamping groove (110); a first connecting head (200) and a second connecting head (300) arranged oppositely; a sealing ring (400) arranged between the first connecting head (200) and the second connecting head (300); a buckle (500) covering the clamping groove (110) of the outer sleeve (100) to lock the first connecting head (200), the sealing ring (400) and the second connecting head (300); wherein the two side walls of the sealing ring (400) respectively extend outwardly along the axial direction to form an insertion ring (410) and a bearing ring (420); the first connecting head (200) and the second connecting head (300) are provided with an insertion slot (210) and a bearing slot (220) at the fitting position with the insertion ring (410) and the bearing ring (420); the length of the insertion ring (410) is longer than that of the bearing ring (420); during assembly, the insertion ring (410) is connected to the insertion slot (210) and is placed in the clamping groove (110) after radial alignment; the two side walls of the clamping groove (110) are respectively provided with an axial expansion limiting strip (111) to make the bearing ring (420) abut against the bearing slot (220) through the axial expansion limiting strip (111) after the rotation of the outer sleeve (100), thereby completing the axial clamping; the axial expansion limiting strip (111) comprises: an inclined section (111a) and a horizontal section (111b); during the rotation of the outer sleeve (100), the inclined section (111a) of the axial expansion limiting strip (111) abuts against the corresponding first connecting head (200) and second connecting head (300) and drives the first connecting head (200) and second connecting head (300) to move towards each other; the fitting position of the first connecting head (200) and the second connecting head (300) with the axial expansion limiting strip (111) is provided with a bearing block (230); the bearing block (230) is arranged close to the inclined section (111a) of the axial expansion limiting strip (111) when the first connecting head (200), the sealing ring (400) and the second connecting head (300) are placed in the clamping groove (110); the sealing ring (400) is provided with an annular cavity (430) close to the inner side; the sealing ring (400) is further provided with a through hole (440) in communication with the annular cavity (430); the top of the sealing ring (400) is provided with a pressurizing piston rod (450), and the gas outlet hole of the pressurizing piston rod (450) is in communication with the through hole (440); the push rod of the pressurizing piston rod (450) is exposed from the buckle (500); when the liquid pressure in the pipeline connecting joint increases, the annular cavity (430) is extruded to push the push rod of the pressurizing piston rod (450) to extend outwardly; the push rod of the pressurizing piston rod (450) is pressed to increase the pressure in the annular cavity (430), thereby increasing the abutting force between the bearing ring (420) and the bearing slot (220).

2. The pipe connecting joint according to claim 1, characterized in that, the length of the clamping groove (110) is L1; the distance between the abutting surface of the first connecting head (200) and the abutting surface of the second connecting head (300) after assembly is L2; wherein L1≥L2.

3. The pipe connecting joint according to claim 1, characterized in that, the abutting surface of the insertion ring (410) is a vertical surface; the abutting surface of the abutting ring (420) is an inclined surface, and the length of the outer side wall of the abutting ring (420) is greater than the length of the inner side wall of the abutting ring (420).

4. The pipe connecting joint according to claim 1, characterized in that, the first connecting head (200) and the second connecting head (300) are both interfaces of valves; or, one of the first connecting head (200) and the second connecting head (300) is an interface of a valve, and the other is connected with an interface of a pipe.

5. The pipe connecting joint according to claim 1, characterized in that, the material of the sealing ring (400) is any one of polytetrafluoroethylene, tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer, polyvinylidene fluoride, and polyether ether ketone.

6. A method of making a connection to a pipe connection fitting according to any one of claims 1 to 5, characterised in that, The connecting method comprises: the insertion ring (410) is connected with the insertion groove (210), and the radial alignment of the first connecting head (200), the sealing ring (400), and the second connecting head (300) is completed; the first connecting head (200), the sealing ring (400), and the second connecting head (300) after connection are placed in the clamping groove (110) of the outer sleeve pipe (100); the outer sleeve pipe (100) is rotated by external force, so that the first connecting head (200) and the second connecting head (300) are driven to move towards each other by the two axial expansion limiting strips (111), so that the abutting ring (420) abuts against the abutting groove (220), and axial clamping is completed; the buckle (500) is covered on the clamping groove (110) of the outer sleeve pipe (100), and the connection is completed.

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